Water Tank Controller Circuit

Water Tank Controller Circuit 

Here is an automatic water tank controller that controls the operation of a water pump through a 12V 10amp relay. When ever the water level of the tank short circuits the points A and B in the circuit diagram, the pump get turned off automatically. This home water pump controller circuit is comparably simple and low cost and can be assembled easily on a common PCB.

water tank controller hasifnoor_Attasheri 9744665935

Working

The circuit schematic diagram of the tank controlller is given on the image. Whe the switch S1 in the circuit is pressed, a biasing will get to the transistor Q1 through resistor R1 and the relay will be turned on. So the pump connected on the relay will also switched on. We can place the terminals A and B in the upper side of the water tank. Whenever the water shortcircuits these points, the Q1 transistor will be on and the relay will cuttoff and the motor also turned off.


Notes

• Make sure that all resistors used in the circuit is 1/2 W.
• The relay power rating can be varied according to the motor ratings.